Sorry, I was thinking of the HCCT for Model T too. The Allen tester for Model T's was a whole different ball of wax. It was only made to test Model T coils and was a hand crank unit that put out AC current.
If you haven't, post on the other forums here and HAMB too might help. Or even over on;
Smokstak® Antique Engine Community
There are several forums there that someone might have one.